US852528A

US852528A - Pawl-press.

Info

Publication number: US852528A
Application number: US35091507A
Authority: US
Inventors: Carl Scherf
Original assignee: Individual
Current assignee: Individual
Priority date: 1907-01-05
Filing date: 1907-01-05
Publication date: 1907-05-07
Anticipated expiration: 1924-05-07

Description

No. 852,528. PATENTED MAY 7, 1907.

G. SGHERF.

' I PAWL PRESS.

APiLIOATION FILED JAN. 6.190!- fiifm ass as QjWL we 407 0 1:

1H: NORRIS PETERS cm, WAsHlNuTqN, n. c.

CARL SOHERF, OF SAARBURG, GERMANY.

' PAWL-PRESS.

Specification of Letters Patent.

Patented May '7', 1907.

Application filed January 5, 1907. Serial No- 350,915.

1'0 a/ZZ whom, it may concern.-

Be it known that I, CARL Sonnnr, electrician, a subject of the King of Saxony, residing. at Saarburg, District Trier, in the Kingdom of Prussia and German Empire, have invented new and useful lmprovements in Pawl-Presses, of which the following is a specification.

g .The subject of my invention is a pawl press having two screw spindles with respectively rightand lefthand threads, the nuts of which, operated by a system of levers, act upon a cross head or bridge carrying the fol lower.

The essential feature of the new press is that the nuts are turned alternately instead of simultaneously, so that the cross head and follower act as a single armed lever. In this manner, for each turn of the lever-system only half as much power is necessary as with prior apparatus, in which the nuts are turned simultaneously.

One form of construction of the new press is illustrated in the accompanying drawing, in which Figure 1 is a side elevation, and Fig. 2 a plan.

I On the screw spindles a, one of which has a right and the other left-hand thread, nuts I) are provided, which are actuated in the usual manner each by a feed lever c 0 respectively, with drop-pawls Z. In the middle, between the spindles a, is mounted a double-armed lever e, turning on a pin f. This lever e is provided with sockets 9 into which levers h are inserted to enable actuation of the lever e. The latter is connected with the feed levers c c by pins i. These pins are furnished with rollers i at the top, engaging in slots 7c in the feed levers. The tail of each of the bolts 11, can be inserted into one of the holes 1. Depending upon whether the pins 6 are inserted into the holes 1" toward the ends, or nearer the middle, of the arms of the lever e, the power necessary to feed forward the nuts will be less or more, respectively. The connection between the nuts I) and feed levers c c is effected by the pawls Z, which slide vertically in the feed levers and engage in corresponding tooth-shaped recesses m in the nuts I). At their bottom ends the pawls Z are chamfered. On rotation of the levers c c in one direction the nuts I) are turned round; on rotation of these levers c c in the opposite direction, on the other hand, the pawls rise, owing to their lower end being chamfered, and Without turning the nuts I) leave one recess m and drop into the next.

The chamfered pawls Z are so disposed that when the lever-system is set in operation for the purpose of pressing, the nuts 0 are turned alternately, the one being actuated while the other is left unoperated by the corresponding pawl Z. The nuts I) thus act in turns upon the cross-head 0, which consists of girders, and which again transmits the power to the follower p, located at the center Owing to the alternate feed of the nuts I), which amount to at most 1-2 mms., the head 0 acts as a single armed lever. The force which has to be exerted on the lever h is, therefore, only half of that which would be requisite were nuts both turned simultaneously.

The rotation of the various parts, necessary owing to the one slded motion of the cross-head andfollower, is enabled by the provision of rounded pressing-surfaces.

Instead of the nuts I) being turned by pinpawls, the rotation may be effected by ordinary ratchet pawls engagingsuitable teeth provided on the top of the nut.

What I do claim as my invention and desire to secure by Letters Patent, is z A pawl press comprising two screw spindles, having respectively right and left hand threads, a nut on each spindle, a cross head guided by the said spindles, a follower on said cross head, a double-armed lever pivoted'at the center of said cross-head, a lever jointed to each arm of said double-armed lever, and pawls at the free ends of said levers adapted to engage the nuts on the screw spindles so as to alternately screw said nuts down.

In testimony whereof I have signed my name'to this specification in the presence of two subscribing witnesses.

CARL SOHERF.

Witnesses:

ALBERT FISCHER, ADoLF CHEVALIER.